Tokyo: I took in my ex's twin sister (1-151).

Summary

Sawayama Haruno begins to question Ezaki Naoha's family background, particularly the absence of an older brother. As they prepare to go out to eat, Naoha insists on arm wrestling to test Haruno's strength. Despite initial hesitations about hurting her, Haruno agrees. During the match, he easily pins her wrist down, leading Naoha to experience an overwhelming sense of powerlessness and submission that she has never felt before. This sensation excites her, making her realize the thrill of being dominated, contrasting her usual confidence in her physical abilities.

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